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Statement of a problem № 3719

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A capacitor of capacitance C is charged to potential V by connecting it to a battery. Let q be the charge on it, E the electric field within the plates and U the energy stored. When a dielectric of constant K is introduced filling completely the space between the plates, how will the following quantities change (i) V , (ii) E , (iii) q , (iv) C and (v) U , when (a) the battery remains connected and (b) the battery is disconnected?

Solution:
A capacitor of capacitance C is charged to potential V by connecting it to a bat

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